C# SQL Server从数据库读取数量并将其显示在消息框中

using System;
using System.Data.SqlClient;
using System.Windows.Forms;

namespace CSharpSQLServerExample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnReadData_Click(object sender, EventArgs e)
        {
            string connectionString = "Data Source=YourServerName;Initial Catalog=YourDatabaseName;User ID=YourUsername;Password=YourPassword";
            string query = "SELECT COUNT(*) FROM YourTableName";

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = new SqlCommand(query, connection);
                connection.Open();
                int count = (int)command.ExecuteScalar();
                MessageBox.Show("数量: " + count.ToString());
            }
        }
    }
}